It is spring now where I live and I am now waking up EVERY morning with a sinus headache. Not so bad on the days I don't work. I take pain killers, go back to bed/sleep and when I wake for the 2nd time, headache gone and congestion is improved.
On work days, however, it is bad. I start work at 8.15 so don't have time to wait for the pain killers to kick in and if I am unable to relax and wait for them to work, sometimes the headache persists all day. Last week, it got so bad, I started to vomit with it and the whole thing meant 24 hours in bed, very unwell.
I took an antihistimine last night. I still had the headache and congestion in the morning, requiring pain killers, although the congestion wasn't quite as bad. I do think it is something to do with the pollen count aggravating an already existing problem.